Feedback The Poem

hey, i need help.......someone tell me....how thehell do i generate enough feed back to get a long enough sustain........how do i generate feedback which i can use in my playin...i want to use the feedback the way townshed did.......so how do i generate enough usable feedback without cranking up the volume too high........or if i have to......with the volume too high....

how do i get enugh feedback without changing my picups????
@everyone....what poem......????
i have no idea how this is happening..all the titles of my threads are changing...
the title of this one was just Feedback and i was referring to the gonging howling noise....
even the name of my other thread changed...it was suposed to be just using the pinky...how it changed to using the pinky to play scales..i have no idea...admins help...
that apart....any other way of getting good feedback....which i can actually use...to get enough feedback generated sustain....??

but isnt there anyother way to get just sustain without using anything but my guitar and amps.......ive been trying to get a good amount of feedback for the intro to estranged...but just dont get enough....